The Y55132 gear shaping machine produced by our factory has a cylinder block part with a total bore size of φ80H7 and a hole length of 405mm. The surface roughness R_a0.4 is required, and the roundness error is 0.015mm. The inner hole needs to be ground and formed. Because there is no special long-hole internal grinding machine or grinding head in our factory, the inner hole cannot be processed. To this end, we have built a lengthening grinding head for the M250A grinding machine, which is simple in structure, easy to use and has high processing precision. After use, the effect is good, overcoming the shortage of equipment and solving the production difficulty. The lengthened grinding head structure is shown in the figure. It consists of a grinding head seat 1, a drive chuck 2, a grinding wheel shaft 3 and a spring seat 4. The total length of the grinding head is 490mm. When machining, the grinding head works in a cantilever state. In order to ensure the accuracy of the rotary motion of the grinding wheel
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